In number theory, a full reptend prime or long prime in base b is a prime number p such that the formula
(where p does not divide b) gives a cyclic number. Therefore the digital expansion of in ... -->
In geometry, the spiral of Theodorus (also called square root spiral, Einstein spiral or Pythagorean spiral) is a spiral composed ofcontiguous right triangles. It was first constructed by Theodorus of Cyrene.
The spiral ... -->